Debby will exit the Northeast on Saturday.
Debby, which weakened from a tropical storm to a tropical depression Thursday afternoon, is slamming the Mid-Atlantic and the Northeast with heavy rain on Friday.
Debby made landfall in Florida as a Category 1 hurricane on Monday and crawled up the East Coast all week.
Debby, now a post-tropical cyclone, is slamming the Northeast with heavy rain.
A life-threatening flash flood emergency was issued in northern Pennsylvania and southern New York due to fast-moving floodwaters.
A flood watch remains in effect for parts of nine states from South Carolina to New Hampshire due to the intense rain.
Showers with some downpours will continue across the Northeast through the evening. Tornadoes are also possible.
Debby will be gone by Saturday morning.
The threat of severe flooding is very high across South Carolina with Tropical Storm Debby "creeping across our state," South Carolina Gov. Henry McMaster warned on Tuesday.
The rain from the slow-moving storm may be particularly heavy from Myrtle Beach to the North Carolina border, the governor said.
Forty-eight state roads are closed due to flooding and 50 high-water vehicles are at the ready to respond, he said.
The highest rain total so far is south of Tampa, Florida, where about 19 inches of rain fell.
In Georgia, more than 11 inches of rain struck northwest of Savannah, and in South Carolina, 14 inches of rain was recorded between Charleston and Hilton Head Island.
On Tuesday afternoon, Debby is located about 10 miles southeast of Savannah and is crawling north at a very slow speed.
The heavy rain will stretch from Charleston to Wilmington, North Carolina, on Tuesday. Storm surge could reach 4 feet from Savannah to Cape Fear, North Carolina, and tornadoes are possible.
Flash flood warnings are in effect for Savannah, Charleston and Myrtle Beach, South Carolina. Rainfall rates could reach 1 to 2 inches per hour during the heaviest downpours, which will bring more flooding.
The worst of the rain is expected along the South Carolina-North Carolina border through Thursday evening. A rare "high risk" for flash flooding was issued from Charleston to Raleigh, North Carolina, where rain totals could climb to 25 inches through Thursday.
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More than 90,000 customers remain without power in Florida, more than 24 hours after Debby tore through the state.
"Restoration is taking longer in areas with flooding and heavy vegetation, as crews must wait for the water to recede and clear through debris before they can restore power," Florida Power & Light said Tuesday morning. "Rest assured, we’ll continue working until everyone who can safely receive power is restored. Avoid these flooded areas and stay away from downed power lines."
A curfew in Charleston, South Carolina, has been extended to 7 a.m. Wednesday as the flood-prone city braces for potentially life-threatening flooding.
"Residents are advised to stay off the roads unless there is an urgent emergency," the Charleston Fire Department said.
Charleston is under a flash flood warning. Up to 1 foot of rain has already fallen in the city, with more to come.
